/*
 This file is part of TALER
 (C) 2015-2016 GNUnet e.V.

 TALER is free software; you can redistribute it and/or modify it under the
 terms of the GNU General Public License as published by the Free Software
 Foundation; either version 3, or (at your option) any later version.

 TALER is distributed in the hope that it will be useful, but WITHOUT ANY
 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
 A PARTICULAR PURPOSE.  See the GNU General Public License for more details.

 You should have received a copy of the GNU General Public License along with
 TALER; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
 */

/**
 * Page shown to the user to confirm creation
 * of a reserve, usually requested by the bank.
 *
 * @author Florian Dold
 */

import { AmountLike, Amounts, i18n, WithdrawUriInfoResponse } from '@gnu-taler/taler-util';
import { ExchangeWithdrawDetails } from '@gnu-taler/taler-wallet-core/src/operations/withdraw';
import { useEffect, useState } from "preact/hooks";
import { JSX } from "preact/jsx-runtime";
import { LogoHeader } from '../components/LogoHeader';
import { Part } from '../components/Part';
import { ButtonSuccess, WalletAction } from '../components/styled';
import {
  acceptWithdrawal, getExchangeWithdrawalInfo, getWithdrawalDetailsForUri, onUpdateNotification
} from "../wxApi";


interface Props {
  talerWithdrawUri?: string;
}

export interface ViewProps {
  details: ExchangeWithdrawDetails;
  amount: string;
  accept: () => Promise<void>;
  setCancelled: (b: boolean) => void;
  setSelecting: (b: boolean) => void;
};

function amountToString(text: AmountLike) {
  const aj = Amounts.jsonifyAmount(text)
  const amount = Amounts.stringifyValue(aj)
  return `${amount} ${aj.currency}`
}


export function View({ details, amount, accept, setCancelled, setSelecting }: ViewProps) {

  return (
    <WalletAction style={{ textAlign: 'center' }}>
      <LogoHeader />
      <h2>
        {i18n.str`Digital cash withdrawal`}
      </h2>
      <section>
        <div>
          <Part title="Total to withdraw" text={amountToString(Amounts.sub(Amounts.parseOrThrow(amount), details.withdrawFee).amount)} kind='positive' />
          <Part title="Chosen amount" text={amountToString(amount)} kind='neutral' />
          {Amounts.isNonZero(details.withdrawFee) &&
            <Part title="Exchange fee" text={amountToString(details.withdrawFee)} kind='negative' />
          }
          <Part title="Exchange" text={details.exchangeInfo.baseUrl} kind='neutral' big />
        </div>
      </section>
      <section>

        <div>
          <ButtonSuccess
            upperCased
            disabled={!details.exchangeInfo.baseUrl}
            onClick={accept}
          >
            {i18n.str`Accept fees and withdraw`}
          </ButtonSuccess>
        </div>
      </section>
    </WalletAction>
  )
}

export function WithdrawPage({ talerWithdrawUri, ...rest }: Props): JSX.Element {
  const [uriInfo, setUriInfo] = useState<WithdrawUriInfoResponse | undefined>(undefined);
  const [details, setDetails] = useState<ExchangeWithdrawDetails | undefined>(undefined);
  const [cancelled, setCancelled] = useState(false);
  const [selecting, setSelecting] = useState(false);
  const [error, setError] = useState<boolean>(false);
  const [updateCounter, setUpdateCounter] = useState(1);

  useEffect(() => {
    return onUpdateNotification(() => {
      console.log('updating...')
      setUpdateCounter(updateCounter + 1);
    });
  }, []);

  useEffect(() => {
    console.log('on effect yes', talerWithdrawUri)
    if (!talerWithdrawUri) return
    const fetchData = async (): Promise<void> => {
      try {
        const res = await getWithdrawalDetailsForUri({ talerWithdrawUri });
        setUriInfo(res);
      } catch (e) {
        console.error('error', JSON.stringify(e, undefined, 2))
        setError(true)
      }
    };
    fetchData();
  }, [selecting, talerWithdrawUri, updateCounter]);

  useEffect(() => {
    async function fetchData() {
      if (!uriInfo || !uriInfo.defaultExchangeBaseUrl) return
      const res = await getExchangeWithdrawalInfo({
        exchangeBaseUrl: uriInfo.defaultExchangeBaseUrl,
        amount: Amounts.parseOrThrow(uriInfo.amount)
      })
      setDetails(res)
    }
    fetchData()
  }, [uriInfo])

  if (!talerWithdrawUri) {
    return <span><i18n.Translate>missing withdraw uri</i18n.Translate></span>;
  }

  const accept = async (): Promise<void> => {
    if (!details) {
      throw Error("can't accept, no exchange selected");
    }
    console.log("accepting exchange", details.exchangeInfo.baseUrl);
    const res = await acceptWithdrawal(talerWithdrawUri, details.exchangeInfo.baseUrl);
    console.log("accept withdrawal response", res);
    if (res.confirmTransferUrl) {
      document.location.href = res.confirmTransferUrl;
    }
  };

  if (cancelled) {
    return <span><i18n.Translate>Withdraw operation has been cancelled.</i18n.Translate></span>;
  }
  if (error) {
    return <span><i18n.Translate>This URI is not valid anymore.</i18n.Translate></span>;
  }
  if (!uriInfo) {
    return <span><i18n.Translate>Loading...</i18n.Translate></span>;
  }
  if (!details) {
    return <span><i18n.Translate>Getting withdrawal details.</i18n.Translate></span>;
  }

  return <View accept={accept}
    setCancelled={setCancelled} setSelecting={setSelecting}
    details={details} amount={uriInfo.amount}
  />
}